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Bond Strength of Textured Epoxy-Coated Bars
Aryal, Ashok Mani Truman, Katelyn Darwin, David O'Reilly, Matt
Aryal, Ashok Mani
Truman, Katelyn
Darwin, David
O'Reilly, Matt
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Abstract
Textured epoxy-coated reinforcement (TECR) was developed to provide comparable corrosion resistance to conventional epoxy-coated reinforcement (ECR) while also reducing the impact of conventional epoxy coatings on bond strength. The bond performance of TECR bars was compared to that of uncoated and ECR bars using beam-end and lap splice tests. Thirty-six beam-end specimens, consisting of 14 uncoated, 8 ECR, and 14 TECR specimens, and 26 lap splice specimens consisting of 5 uncoated, 3 ECR, and 5 TECR specimens each for No. 6 and No. 11 [19 and 36 mm] bars were tested. The lap splice test parameters also included nominal concrete compressive strength (5 and 10 ksi [34.5 and 69.9 MPa]), quantity of transverse confining reinforcement, splice length (16 to 69 in. [406 to 1753 mm]), and nominal bar stress at failure (60 to 90 ksi [413.7 to 620.5 MPa]).
In the beam-end tests, the bond strength of textured epoxy-coated reinforcement (TECR) ranged from 0.97 to 1.00 times that of uncoated reinforcement and exhibited better bond strength than epoxy-coated reinforcement (ECR). In the lap splice tests, the splice strength of TECR bars averaged 1.05 times that of uncoated bars indicating TECR bars have a comparable bond strength to uncoated bars. The splice strength of ECR bars averaged 0.83 times that of uncoated bars. In comparisons of the largest crack widths in the constant moment regions of the lap splice specimens away from the splices, specimens containing TECR and uncoated bars exhibited no distinct differences in crack widths. ECR specimens, however, had wider cracks than the specimens containing TECR and uncoated bars. The results suggest that TECR coating can be qualified in terms of bond strength if it can provide a relative bond strength of at least 96% to that of uncoated bar specimens in the beam-end test and that the development length for uncoated bars can be used for TECR bars without a coating modification factor.
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Date
2023-01
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University of Kansas Center for Research, Inc.
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SMReport_151.pdf
Adobe PDF, 4.94 MB
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Keywords
Bond (concrete to reinforcement), Coatings, Deformed reinforcement, Epoxy-coated reinforcement, Lap splices, Pullout tests, Reinforcing steels, Splicing, Structural engineering, Textured epoxy-coated reinforcement
Citation
Aryal, A. M., Truman, K., Darwin, D., and O’Reilly, M. “Bond Strength of Textured Epoxy-Coated Bars,” SL Report No. 151, University of Kansas Center for Research, Inc., Lawrence, KS, January 2023, 300 pp.